This seems tied to mass hysteria, mob mentality and cults and religions and governemnts, fraternities, etc..(I could go on and on)groups, in general.
I feel there is some kind of subconscious mental/spiritual link we all have (it only makes sense since we are all simply extensions of the Godhead..in my belief system, at least, it makes sense to me)and I think that depending on some sort of proximity physical and/or mental/emotional connections made (feeding into each others energies) those links can build up a bit..at least for a bit.
They say "energy goes where it's directed"
“Whether you sniff it smoke it eat it or shove it up your ass the result is the same: addiction.”
― William S. Burroughs
(love&forgive yourself..and everyone else)